BC ECONOMY
Saved by @Alex1Powell

EVs DO NOT EMIT MORE PM

Recently @OECD published a report about particulate matter (PM) from road transport. Newspaper headlines blared that electric vehicles where worse than combustion vehicles. That conclusion was wrong according to the report itself.

Let me show you.

 The report (published december 7) can be found here: https://t.co/1HpicKexOt
It's main point is well taken: as cars get cleaner, fine particles emitted by brakes, tires and road surfaces will become more important.
The table comparing electric and combustion engines is on page 92. I took averages of low and high values to get the graph in the first tweet.
I merely took the averages. To get this.
I think it is a terrific report that pulls together a LOT of literature on fine particles that cars spew into the air and that make us sick.

We have ignored this problem for too long, and there's more here than simply exhaust!
I have just two gripes with the article:

1) Electric vehicle weight
It estimates batteries at 10 kg/kWh when in reality it's already below half of that. So it makes electric vehicles much too heavy and doesn't take into account that in 2030 they will be much lighter still.
2) Simply comparing grams
We know that the stuff that comes out of the exhaust pipe is really bad for your health.

How that compares to sand and rubber from the road (gram for gram and particle for particle) is still completely unclear. They state this clearly themselves.
We know that a lot of the stuff in there can be bad for your health (see table).

But how much is how bad and what is the impact of particle size? For the stuff that's not from the exhaust we basically have no idea.
These studies about road dust are the closest the report comes to quantifying this but as you can see it's a mess.
Even how vehicle characteristics influence PM is only very vaguely know.
So for me the summary:

We know particles emitted from the road and the wheels of cars make us sick but that's about it. More research is urgently needed so we can avoid millions of deaths.
And there is a LOT we can do!

By switching to electric vehicles we are probably eliminating some of the most harmful emissions (from tailpipes and brake pads).

We could try to make tires more wear resistant (probably not a top priority of manufacturers).
We can find out what materials in tires are worst and leave them out.

We can construct roads in a way that traps part of the particles or we might even vacuum them up before they are released out into the open.https://t.co/mxA62vhuDG
Most importantly we should use lighter cars. So a monster like this Cybertruck certainly doesn't make your neighborhood safer or healthier.
Bottom line: electric cars are less bad for the climate and air quality than regular cars, but once they eliminate tailpipe and brake pad emissions we should focus on emissions from tires and roads. And that's almost virgin territory. Time to get to work on that!

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1/n


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दधीचि ऋषि को मनाही थी कि वह अश्विनी कुमारों को किसी भी अवस्था में ब्रह्मविद्या का उपदेश नहीं दें। ये आदेश देवराज इन्द्र का था।वह नहीं चाहते थे कि उनके सिंहासन को प्रत्यक्ष या परोक्ष रुप से कोई भी खतरा हो।मगर जब अश्विनी कुमारों ने सहृदय प्रार्थना की तो महर्षि सहर्ष मान गए।


और उन्होनें ब्रह्मविद्या का ज्ञान अश्विनि कुमारों को दे दिया। गुप्तचरों के माध्यम से जब खबर इन्द्रदेव तक पहुंची तो वे क्रोध में खड़ग ले कर गए और महर्षि दधीचि का सर धड़ से अलग कर दिया।मगर अश्विनी कुमार भी कहां चुप बैठने वाले थे।उन्होने तुरंत एक अश्व का सिर महर्षि के धड़ पे...


...प्रत्यारोपित कर उन्हें जीवित रख लिया।उस दिन के पश्चात महर्षि दधीचि अश्वशिरा भी कहलाए जाने लगे।अब आगे सुनिये की किस प्रकार महर्षि दधीचि का सर काटने वाले इन्द्र कैसे अपनी रक्षा हेतु उनके आगे गिड़गिड़ाए ।

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अभिमान के कारण ऋषि बृहस्पति के पधारने पर न तो इन्द्र ही खड़े हुए और न ही अन्य देवों को खड़े होने दिया।देवगुरु बृहस्पति इन्द्र का ये कठोर दुर्व्यवहार देख कर चुप चाप वहां से लौट गए।कुछ देर पश्चात जब देवराज का मद उतरा तो उन्हे अपनी गलती का एहसास हुआ।
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Vaarahi is one of the Saivite Shakti deities with the group of goddesses known as SAPTAMATAS.
They are: Brahmi, Maheshwari, Kaumari, Vaishnavi, Vaarahi, Mahendri and Chamundi. 1/n


They are the Shakti (female) equivalents of their male counterparts. Vaarahi is the Shakti of Bhairavar who is one of the Amsam of Bhairavar.Created from the boar avatara of Vishnu, Vaarahi is often associated with Goddess Kamala (one of the Mahavidyas). 2/n


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and led the devotees ultimately to SriVidyas. She is also called Panchami). With Kurukalla, she is accorded the parental status to Sri-Chakra (Lalita Tripura-Sundari). While Kurukalla represents the full moon, Vaarahi represents the new-moon. 4/4

Jai Maa Varahi 🙏


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